GCN Circular 27314
C. Malacaria (NASA-MSFC/USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 02:34:23.85 UT on 03 March 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200303A (trigger 604895668 / 200303107), which was also detected by the Swift/BAT and Swift/XRT (Cenko et al. 2020, GCN 27297, Goad et al. 2020, GCN 27300). The Fermi GBM Final Real-time Localization (GCN 27294) is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 106 degrees. The GBM light curve shows a complex structure with a duration (T90) of about 82 s (50-300 keV). The time-averaged spectrum from T0-2.8 s to T0+95.7 s is best fit by a Band function with Epeak = 151 +/- 18 keV, alpha = -1.26 +/- 0.05, and beta = -2.14 +/- 0.10. The event fluence (10-1000 keV) in this time interval is (3.23 +/- 0.08)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+35.1 s in the 10-1000 keV band is 9.2 +/- 0.4 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"